array map + class method/function as callback + call_user_func

Question

I don't know what I have done wrong with the code below but it is not working.

if($_data_count = count($_csv_raw_array) > 0){
            foreach($_csv_raw_array as $_csv_row){
                array_push($this->_data, array_map(call_user_func(array($this, 'replace')), $_csv_row));
            }
            return $this->result(true, 'CSV parsing done.', '', $this->_data);
        }

// And the replace function is:

    private function replace($_value){
    return preg_match('/(\r\n|\n|\r)/', $_value) ? '' : $_value;
}

But I don't know why it is not working and throws an exception:

A PHP Error was encountered

Severity: Warning

Message: Missing argument 1 for Import::replace()

Filename: libraries/Import.php

Line Number: 116

Basically what I wanted to to here is import a CSV file which I already imported, now I want to replace any new line characters that is present within the array to be replaced with empty (nothing). But every time I execute this code it throws an exception. Can you people out there suggest. Please.

Thanx

Answer 1

As pointed out in the comments, judging by your code you will want to drop that call_user_func, since that is causing the function to be called immediately and that does not seem to be what you want, which I presume is to filter out all the elements within $_csv_row in each iteration:

if($_data_count = count($_csv_raw_array) > 0){
    foreach($_csv_raw_array as $_csv_row){
        array_push($this->_data, array_map(array($this, 'replace'), $_csv_row));
    }
    return $this->result(true, 'CSV parsing done.', '', $this->_data);
}

We can only guess what is your intention though, you might want to provide a sample csv and the desired output so we can understand more precisely what you are looking for if this doesn't solve the problem.